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That's the selling point behind the 'Tornado' brand 'fuelsaver'. It supposedly makes the air spiral into a vortex.
It does nothing ( except makes your wallet thinner. )
In one test, it actually reduced fuel economy, due to the fact that it is a restriction in the intake.
" Any vortex that is generated is immediately destroyed when the air hits the throttle body ."
So .... if you could create a VG effect inside the manifold, it might do .... something .... but maybe ( probably ) not.
Sorry. It sounds like a great idea though.
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